Ball point pen



FIG. 1 is a front elevational view of a ball point pen showing my new design;

FIG. 2 is a side elevational view thereof, the side of which being substantially a mirror image;

FIG. 3 is a perspective view thereof shown on a reduced scale; and

FIG. 4 is a top plan view thereof. 

The ornamental design for a ball point pen, substantially as shown and described. 